GVE_RX_BUF_THRESH_DQO
if ((bufq->tail & (GVE_RX_BUF_THRESH_DQO - 1)) == 0)
((bufq->tail & ~(GVE_RX_BUF_THRESH_DQO - 1)) -
if (num_bufs_avail_to_hw < GVE_RX_BUF_THRESH_DQO) {